#include <bits/stdc++.h>
#define fi first
#define se second
typedef long long ll;
using namespace std;
void solve()
{
    int a, b, x;
    cin >> a >> b >> x;
    if (min(a, b) + x > max(a, b))
        cout << "YES";
    else
        cout << "NO";
}
int main()
{
    cin.tie(nullptr);
    cout.tie(nullptr);
    ios::sync_with_stdio(false);
    int T = 1;
    // cin>>T;
    while (T--)
    {
        solve();
    }
    return 0;
}